如何把这个API写成一个数组返回

# 修改成下面这样 放进一个数组里怎么编写代码啊 API接口 数据自己随便写

{product:[{"id":1,"img":"https://images.unsplash.com/photo-1551334787-21e6bd3ab135?w=640","name":"f1"},
{"id":2,"img":"https://images.unsplash.com/photo-1551214012-84f95e060dee?w=640","name":"f2"},
{"id":3,"img":"https://images.unsplash.com/photo-1551446591-142875a901a1?w=640","name":"f3"}]}

现在是这样怎么修改啊

实体类
public class Product {
    private Integer id;
    private String img;
    private String name;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getImg() {
        return img;
    }

    public void setImg(String img) {
        this.img = img;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Product{" +
                "id=" + id +
                ", img='" + img + '\'' +
                ", name='" + name + '\'' +
                '}';
    }
}

Vo
import java.util.List;

public class ProductVo {

    private List<Product> product;

    public List<Product> getProduct() {
        return product;
    }

    public void setProduct(List<Product> product) {
        this.product = product;
    }

    @Override
    public String toString() {
        return "ProductVo{" +
                "product=" + product +
                '}';
    }
}

控制层
@RestController
@RequestMapping("/test")
public class TestController {

    @GetMapping(value = "/getProductList")
    public String getProductList() {
        Product product1 = new Product();
        Product product2 = new Product();
        Product product3 = new Product();
        product1.setName("product1");product1.setId(1);product1.setImg("iiiiiiiiiiiiiiiiiiiiiiiiiii");
        product2.setName("product2");product2.setId(2);product2.setImg("iiiiiiiiiiiiiiiiiiiiiiiiiii");
        product3.setName("product3");product3.setId(3);product3.setImg("iiiiiiiiiiiiiiiiiiiiiiiiiii");

        List<Product> list = new ArrayList<>();
        list.add(product1);list.add(product2);list.add(product3);

        ProductVo productVo = new ProductVo();
        productVo.setProduct(list);

        return JSONObject.toJSONString(productVo);
    }
}

访问接口

用string 拼接，然后转化json